Comma
- Use a comma before a conjunction (and, or, so, but) that separates two independent clauses.
She wanted to learn to cook, so she decided to buy herself a book.
- Don't use a comma before a conjunction that separates two incomplete sentences.
She worded in the library and studied at night.
- Use a comma to separate interrupting expressions from the rest of the sentence.
Do you know, by the way, what time it is?
- Use a comma after yes and no in answers.
Yes, my father is a doctor.
- Use a comma to separate an apposite form the rest of the sentence.
Mr. Smith, the new teacher, really knows how to teach.
Would you like to try a taco, a traditional Mexican dish?